build: pylint can run in parallel

But for some reason finds three new violations when you do?

coverage/pytracer.py

@@ -166,12 +166,12 @@ def _trace(
         if event == "call":
             # Should we start a new context?
             if self.should_start_context and self.context is None:
-                context_maybe = self.should_start_context(frame)
+                context_maybe = self.should_start_context(frame)    # pylint: disable=not-callable
                 if context_maybe is not None:
                     self.context = context_maybe
                     started_context = True
                     assert self.switch_context is not None
-                    self.switch_context(self.context)
+                    self.switch_context(self.context)   # pylint: disable=not-callable
                 else:
                     started_context = False
             else:
@@ -280,7 +280,7 @@ def _trace(
             if self.started_context:
                 assert self.switch_context is not None
                 self.context = None
-                self.switch_context(None)
+                self.switch_context(None)   # pylint: disable=not-callable
         return self._cached_bound_method_trace
 
     def start(self) -> TTraceFn:

tox.ini

@@ -97,7 +97,7 @@ commands =
     # If this command fails, see the comment at the top of doc/cmd.rst
     python -m cogapp -cP --check --verbosity=1 doc/*.rst
     python -m cogapp -cP --check --verbosity=1 .github/workflows/*.yml
-    python -m pylint --notes= --ignore-paths 'doc/_build/.*' {env:LINTABLE}
+    python -m pylint -j 0 --notes= --ignore-paths 'doc/_build/.*' {env:LINTABLE}
     check-manifest --ignore 'doc/sample_html/*,.treerc'
     # If 'build -q' becomes a thing (https://github.com/pypa/build/issues/188),
     # this can be simplified: